球磨机更新换代的研究方向，应在“磨”上下功夫才行。

Therefore, the researching direction introducing a new generation of a ball mill should be placed on the improvement of grinding processing.

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磨牙症是常见的口腔副功能活动，是指咀嚼食物以外的时段内，上下牙齿相互紧咬或磨动的现象。

Bruxism is a common oral parafunctional activity. It is generally defined as the activity of grinding or gnashing of the teeth at times other than during the mastication.

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电机上下导轴承磨损极限，要更换轴承； 转子上下轴套偏磨极限，要更换轴套；

Motor upper and lower guide bearing wear limit, to replace the bearings, rotor shaft eccentric wear limit, to replace bushings;

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